Control Charts for Short Runs: Nonconstant Process and Measurement Error
作者:
FarnumNicholas R.,
期刊:
Journal of Quality Technology
(Taylor Available online 1992)
卷期:
Volume 24,
issue 3
页码: 138-144
ISSN:0022-4065
年代: 1992
DOI:10.1080/00224065.1992.11979384
出版商: Taylor&Francis
关键词: Control Charts;Deviations from Nominal Value
数据来源: Taylor
摘要:
When the usual assumption of constant variances does not hold, the recommended substitute for a deviations from nominal (DNOM) chart is to chart standardized deviations. This has the added difficulty of estimating different standard deviations for each subgroup. As an alternative to this, an approach to DNOM charts that allows more general process and measurement error models is presented. When applied to the constant variance case, the usual chart of differences from nominal results. When applied to the constant coefficient of variation case, a new DNOM chart based on ratios of subgroup means to nominals results. Both charts have the desirable feature of constant control limits.
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